/*
 * Copyright 2023 The Bazel Authors. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.google.idea.blaze.qsync.query;

import java.util.Formattable;
import java.util.Formatter;

public interface TruncatingFormattable extends Formattable {
  String toString();

  @Override
  default void formatTo(Formatter formatter, int flags, int width, int precision) {
    // We implement Formattable for custom "precision" (max length) handling to allow a truncated
    // query expression to be shown as such in the log, using normal string formatting.
    String s = toString();
    if (precision == -1 || s.length() < precision) {
      formatter.format(s);
      return;
    }
    final String truncated = "<truncated>";
    if (precision < truncated.length()) {
      formatter.format(s.substring(0, precision));
      return;
    }
    formatter.format(s.substring(0, precision - truncated.length()));
    formatter.format(truncated);
  }
}
